The Siemens 5SL6104-8CC is a 1-pole miniature circuit breaker from the SENTRON 5SL6 family, rated 4 A with a D tripping characteristic for 230/400 V AC circuits. Single-pole construction means it switches only the phase conductor — used in single-phase branch circuits or per-phase protection in three-phase panels where each pole is a separate breaker. The D-curve at 4 A is a relatively uncommon combination; it's typically specified for small motors, solenoid valves, or control transformers where the inrush exceeds what a C-curve (5–10× In) would pass.
RoHS compliant since June 2013, with REACH candidate-list declarations available on request.